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We discarted QZPrinter, for example, because this can't work from a tablet, and we are going for the same approach, using RAW printing with fopen. Did you tried under Windows OS? We are having problems accesing USB printers, because on Windows there aren't something like "/dev/lp0" and we are accessing the printer, sharing it and with //localhost/USBPrinterName

In local this works but we get permission denied over a shared printer in other machine like //anotherComputer/USBPrinterName

Some idea?

Note: For clarification, we are doing something like a spool service. A point where all petitions goes and from there printing is distributed.

Comment

Likely the rights of user of the service of your apache server doesnt allow access to the external devices. Create a seperate user with the rights to print and make that the user that runs the apache service (this also works for the apache service from scriptcase of course).

I use this with another programm. My Printer is only connected to a raspberry PI, which has wireless stick. So i can place my printer where ever i want and can print from every place on the world and from every machine, which has internet. Maybe you can also connect a POS printer like this?